Hi,

I am trying to understand how Dixell controls determine the temperature readings through an NTC/PTC probe. Please see the attached image for reference.

Dixell Control.JPG

Based on my research and understanding, the way I believe it would work is that a voltage is passed through terminal 11, through an NTC/PTC probe, and based on the voltage drop on terminal 10 or 12 the resistance value is calculated and a temperature is determined from that. Is my understanding correct? If not can you give me a better description as I am just making an assumption.

The reason I am asking is that if a probe is connected to terminal 9 and 10, the evaporator gets a temperature reading, even though it is wrong, but I thought terminal 9 was a voltage free contact and therefore terminal 10 should get no reading?

If you anyone can give me any clarification I would really appreciate it.

Thanks in advance,